The correct option is (d) diagnose infectious diseases
Explanation: Biosensors have been applied in medical field to diagnose infectious and non-infectious diseases. Biosensors have applied in different fields such as follows:
• Agriculture: To detect plant nutrients, fertilizers and pesticides.
• Environment: For pollution monitoring – BOD, COD, NH3, NO3, SO3 etc.
• Mining: To detect toxic compounds and gases.